I don't just buy the first thing I see either and I also have to be tight with my funds. Its not that I am tight wad it just common sense pay a fair price for things. Impulse buying can get you in trouble quick. Just buying a low cost item can get you by for a while while you save up, research, and when a good sale price comes along jump on it.
It is like my AirCat 1300 ft-lb impact wrench, I could not initial afford it so I was a 250 ft-lbs low end Campbell Hausfeld impact. I don't think the Campbell even had that much break away torque as I could even remove my wheel nuts on my truck with it. I cuss it many times as I had to pull out the breaker bar and with a cheater extension. I have since passed the Campbell along to someone else that could use it. Now I do work on equipment that have nuts tighten at 300 ft-lbs so it was badly needed. Those that were at 300 fl-lbs I was using a breaker bar with 5 ft extension and a 250 lb jumping weight before. IE my fat self. I actually pick up the machine a couple times while jumping on the extension. I even had a few bar blade nuts that I had to put both feet on the equipment while using the same setup and row boat them loose. My back doesn't like that at all so I glad I got to upgrade.
As for taking several seconds it is to be expected at the low torque levels (110 nm equals 81 ft lbs) you have as my wrench it would just took a bump of the trigger. I do think that flywheel nut is probably tighten under that.
Now when you get serious about getting a high torque do you research. Some pneumatics are air hogs meaning they require a very high flow rate to achieve the rated output. This is something surprise about the Aircat as it sips the air as compared to that old Campbell which use more air with less results. I now can carry a 11 cu ft air tank to the field to remove a few bolts and nuts before the pressure get too low.
Now of course you going electric instead of pneumatic and there are fairly powerful ones out there now with the new batteries on the market. I have seen some that are close to 800 ft lbs but their cost is rough on the bank account. But paying attention to sales you can be lucky to find one reasonable.
Small projects like yours is when these smaller impacts are very handy. Just remember a couple things. One is never tighten with the impact things like flywheels as they can be over torqued and crack leading to sever failures. Second not everything can taken apart with an impact. A good example is the fan on a Stihl backpack blower. Just not enough resistance to the spinning force. You can try all day and get no where but with a piston stop and a break bar it comes off very easily.
As for the fin reattached if its aluminum just forget it and if cast iron one it can be welded though they are never as strong as before. Now this is just a personal opinion and some of the other techs may have some ideas that work. Heck I got an image somewhere where a bloke had riveted a Briggs flywheel together. A dangerous thing he did.
